linux-kernel - [PATCH] driver: zram: fix wrong counting on pages

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Date:   Tue, 20 Jul 2021 14:47:38 +0800
From:   Huangzhaoyang <huangzhaoyang@...il.com>
To:     Minchan Kim <minchan@...nel.org>,
        Zhaoyang Huang <zhaoyang.huang@...soc.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCH] driver: zram: fix wrong counting on pages_store

From: Zhaoyang Huang <zhaoyang.huang@...soc.com>

It makes the statistic confused when counting pages_store in during writeback.
pages_store should just reflect the swapped pages on ZRAM, while bd_writes be
responsible for writeback things.

Signed-off-by: Zhaoyang Huang <zhaoyang.huang@...soc.com>
---
 drivers/block/zram/zram_drv.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index cf8deec..6bdaa9d 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -765,7 +765,6 @@ static ssize_t writeback_store(struct device *dev,
 		zram_set_flag(zram, index, ZRAM_WB);
 		zram_set_element(zram, index, blk_idx);
 		blk_idx = 0;
-		atomic64_inc(&zram->stats.pages_stored);
 		spin_lock(&zram->wb_limit_lock);
 		if (zram->wb_limit_enable && zram->bd_wb_limit > 0)
 			zram->bd_wb_limit -=  1UL << (PAGE_SHIFT - 12);
-- 
1.9.1